IBM 8408-44E Site And Hardware Planning page 162

Figure 77. Two RAID SAS adapters to a disk expansion drawer in a multi-initiator HA JBOD configuration
Note: This configuration is only supported by the AIX and Linux operating systems with specific SAS
adapters and requires special user configuration setup. See SAS RAID configurations for additional
information.
Internal disk drive sharing
The following information is for use after the FC 5901 SAS Storage adapter is installed. Install the adapter
and then return here. For more information about the PCI adapters topic, see Managing PCI adapters for
the 8247-21L, 8247-22L, or 8284-22A or Managing PCI adapters for the 8247-42L, 8286-41A, or 8286-42A.
Please review the tasks in the Before you begin section before you proceed with the following procedure.
This feature allows you to split the internal disks in the system unit enclosure into groups that you can
manage separately.
1. Stop and power off the system. For more information, see Stopping a system or logical partition.
2. Cable a single system unit enclosure by completing the following steps:
a. Attach the cable to the SAS port on the rear bulkhead of the system unit enclosure to the top port
in the SAS Storage Controller as shown in the following figure.
Restriction: Internal disk drive sharing is only available when internal cable feature FC 1815 is
installed from the DASD backplane to the read bulkhead of the system unit enclosure. Also FC
5662 175 MB cache RAID - dual IOA enablement card must not be installed. The SAS Storage
Controller might be in any of the other slots that support it.
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